Uplink Interference Cancellation via Cross-Correlation Analysis
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Solution Overview
Problem
Current inter-cell interference reduction techniques in wireless communication systems, such as indirect and direct IRC methods, either require high implementation complexity and overhead or do not guarantee high performance gains, necessitating a method that can effectively mitigate inter-cell interference with reduced overhead.
Innovation Solution
A direct Interference Cancellation (IC) method based on blind Inter-Cell Interference (ICI) sensing in the LTE uplink, where a base station receives a reference signal, generates interference candidate signals, calculates cross-correlation values to estimate resource block sizes, offsets, group indices, timing offsets, and cyclic shifts, and performs interference reduction using these estimates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct IRC technique is used to mitigate inter-cell interference, then performance gain is improved, but overhead information and implementation complexity increase
Solution Approach 1:
The patent extracts only the essential interference characteristics (cross-correlation values) from the received signal, rather than processing complete interference information. By focusing on extracting correlation values between reference signals and candidate interference signals, the system achieves interference mitigation without requiring full direct IRC processing, thus reducing complexity while maintaining performance.
Solution Approach 2:
The patent performs partial interference cancellation by estimating and removing only the dominant interference components identified through cross-correlation analysis, rather than attempting to cancel all interference sources. This partial action approach achieves sufficient performance gain while significantly reducing the computational burden compared to complete direct IRC implementation.
2Reliability
If direct IRC technique is used to mitigate inter-cell interference, then performance gain is improved, but overhead information increases
Solution Approach 1:
The patent extracts only the minimal necessary interference parameters (cross-correlation values and resource block positions) from the received signal, avoiding the transmission of complete interference information. The base station performs local correlation analysis to identify interference characteristics, reducing the need for overhead information exchange between base stations while maintaining effective interference cancellation.
3Device complexity
If indirect IRC technique is used to mitigate inter-cell interference, then implementation complexity is reduced, but performance gain decreases
Solution Approach 1:
The patent introduces cross-correlation analysis as an intermediary step between indirect and full direct IRC approaches. By using correlation values as intermediate parameters to identify and characterize interference sources, the system bridges the gap between the simplicity of indirect IRC and the performance of direct IRC, achieving better performance with moderate complexity.
Data Source
AI summary
A method and an apparatus for detecting inter-cell interference in a mobile communication system are provided. A base station receives a reference signal (RS) from a terminal, generate one or more interference candidate RSs, calculate a cross correlation of the one or more interference candidate RSs and the received RS, estimate at least one of a size of a Resource Block (RB) an offset of the RB, a group index (U), and a cyclic shift (CS) by using a preset number of interference candidate RSs in an order of the large cross correlation. The base station further removes an interference signal or performs a direct reduction by using at least one of the estimated RB size, the RB offset, the timing offset, and the group index (U). According to the present disclosure, it is beneficial to mitigate or cancel inter-cell interference problem on an uplink transmission without any assistance of neighbor base stations and/or adjacent cells in a wireless communication system.